A pool of standing water could be hiding A. flash flood currents that could sweep your car away. B. deep sinkholes. C. all of the above.

A pool of standing water could be hiding the deep sinkholes that are present in the pool for draining the water away. So, the correct option that matches with statement above is B.

Standing water refers to a condition of water in the pool when it is more still than the movements displaced by the way of waves and there is very less atmospheric pressure on the water.

Hence, the correct statement will be A pool of standing water could be hiding deep sinkholes present in the pools that drain away the water. And the correct option is B.

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B. deep sinkholes

separation of church and state? not sure what you mean.